Is it possible to configure NHibernate at runtime setting the loading-technique (eager/lazy) for a collection

Question

Ya is this possible :) ?

Answer 1

You can change the fetch mode per query dynamically.

IList cats = sess.CreateCriteria(typeof(Cat))
    .Add( Expression.Like("Name", "Fritz%") )
    .SetFetchMode("Mate", FetchMode.Eager)
    .SetFetchMode("Kittens", FetchMode.Eager)
    .List();

See section 12.5 of the documentation.